#include<iostream>
#include<vector>
#include<queue>
#include<cstring>
#include<cmath>
#include<map>
#include<set>
#include<cstdio>
#include<algorithm>
#define debug(a) cout<<#a<<"="<<a<<endl;
using namespace std;
const int maxn=2e2+10;
typedef long long LL;
inline LL read(){LL x=0,f=1;char ch=getchar();	while (!isdigit(ch)){if (ch=='-') f=-1;ch=getchar();}while (isdigit(ch)){x=x*10+ch-48;ch=getchar();}
return x*f;}
LL a[maxn];
int main(void){
   cin.tie(0);std::ios::sync_with_stdio(false);
   LL t;cin>>t;
   while(t--){
      LL n;cin>>n;
      for(LL i=1;i<=n;i++) cin>>a[i];
      bool flag=1;
      for(LL i=1;i<=n;i++){
         bool ok=0;
         for(LL j=1;j<=sqrt(a[i]);j++){
             if(j*j==a[i]){
                ok=1;
             }
         }
         if(ok==0){
            flag=0;break;
         }
      }
      if(flag==0){
         cout<<"YES"<<"\n";
      }
      else{
         cout<<"NO"<<"\n";
      }
   }
   return 0;
}
